This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A058400 #8 Apr 21 2012 15:41:18 %S A058400 1,2,1,3,2,1,5,4,3,1,7,6,5,3,1,11,10,9,7,4,1,15,14,13,11,8,4,1,22,21, %T A058400 20,18,15,10,5,1,30,29,28,26,23,18,12,5,1,42,41,40,38,35,30,23,14,6,1, %U A058400 56,55,54,52,49,44,37,27,16,6,1,77,76,75,73,70,65,58,47,34,19,7,1,101 %N A058400 Triangle of partial row sums of partition triangle A058398. %C A058400 Mirror of A026820. - _Omar E. Pol_, Apr 21 2012 %F A058400 a(n, m) = sum(A058398(n, k), k=m..n). %e A058400 Triangle begins: %e A058400 1; %e A058400 2, 1; %e A058400 3, 2, 1; %e A058400 5, 4, 3, 1; %e A058400 7, 6, 5, 3, 1; %e A058400 11, 10, 9, 7, 4, 1; %e A058400 15, 14, 13, 11, 8, 4, 1; %Y A058400 Columns 1-3: A000041(n), A000065(n), A007042(n+1). %Y A058400 Cf. A008284. %K A058400 nonn,tabl %O A058400 1,2 %A A058400 _Wolfdieter Lang_, Dec 11 2000